Questions tagged [hvac]
(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.
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How does a Google Nest power connector work?
I am looking at the installation instructions and they all show that the power connector goes back to the furnace/AC control panelIf this is installed just to make sure the thermostat gets enough ...
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Why can't my Trane/Honeywell thermostat be replaced with a Google Nest non learning thermostat? [closed]
The wiring for my thermostat looks like below. This is a Trane (Honeywell ?) TCONT602AF22MA
Terminal designations as per their manual
Here is the result after answering their questions.
I want to ...
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Furnace Control board or Bad Thermostat - Dual Fuel System no longer works
I have a Goodman furnace paired with Trane XR 13 (4TWR3024A1000AA) in a dual fuel configuration with a Goodman gas furnace (GMS80453ANA) as my auxiliary heat. The system is managed by an Ecobee 4.
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New Thermostat displaying inaccurate for outdoor temperature sensor
I installed a new Honeywell TH8321WF1001 thermostat to replace a Carrier programmable thermostat. This is a dual fuel Carrier system (heat pump with gas backup). The new HW stat is working fine ...
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Can the exhaust duct of an ERV vent *into* the garage?
I am looking to install an ERV in my house and am currently trying to determine good locations for the intake and exhaust vents. While I have identified other candidate locations for the exhaust vent, ...
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What keeps rain out of a Vertical PVC Concentric Vent?
All pics show are the Vent Cap, which is the exhaust and the inlet air cap. What is used for a RAINCAP?
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Lennox G20 Furnace Not Working
I've got a 1997 Lennox G20 furnace. A few weeks ago the blower stopped coming on after the burners turned on. The burners would come on for about a minute and then the furnace would shut down ...
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Is the cost quote for a 2.5 ton ac system replacement reasonable? [closed]
I am looking to have my Grand Aire 2.5 ton split system heat pump replaced in my home. It has developed a Freon leak and is an older system, almost 14 years old. I reached out to a local reputable ...
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Trane XR95 No power (2 volts) to Thermostat
Trane XR95 ~2.2V at Thermostat
Woke up this morning to a cold house and a thermostat message saying “no power to the Red wire.” Measured R and C using a multimeter and it reads ~2.2 Volts. Took the ...
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How can I prevent pest ingress past a flue thimble?
Twice now, rats have gotten into my attic and garage. I've seen them travel from the water heater pipe into the attic from the gap you can see in the picture.
Unfortunately, the pipe has sagged away ...
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Oil Hydro Air & Heat Pump Efficiency
We recently moved into a 5,000 ft² home in central Massachusetts with the following system that was installed in 2006:
3 zone hydro-air heat with Veissman Vitorond 100 boiler and Riello 40-F5 burner. ...
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Can I insulate main floorboards overhead hvac/ducts in basement?
My Hvac is in unfinished basement and part of it is crawl space which is rock. Built 1900. Is it okay to insulate my exposed floor boards of main house? Which is the ceiling of hvac/ducts/basement. No ...
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Is this the correct relay if I'm trying to be able to run just the blower on my electric Coleman 3500A816?
I'm trying to modify my furnace so that I can run just the blower motor. It's an electric Coleman 3500A816. I saw a prior query about the same situation, but I was wondering if I have found the ...
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Installing Nest Thermostat 3rd Gen with Power Adapter to Honeywell HZ311 Zone Controller
I’m attempting to hook up my Nest 3rd Gen thermostat to my zone controller and everything appeared to be working correctly.
However, after turning the system back on and cycling through heat and cold, ...
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How do I Eliminate the Recurring Dead Animal Smell Coming From Registers?
There is an intermittent smell of dead animal coming from the floor registers in our house. Comes and goes. First, we smelled it only near the fireplace. Opened the flue and stuck my nose up the ...
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Can a heat pump designed for mini-split system be used for central AC ductwork?
I am looking at replacing my old central AC unit with a heat pump one using existing ductwork. A contractor quoted me Fujitsu Airstage indoor unit AMUG48LMAS with outdoor unit AOUG48LMAS1. I checked ...
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How should I connect flexible plastic duct to a metal duct?
I have an insulated duct like this: https://www.homedepot.com/p/Master-Flow-4-in-x-12-ft-Insulated-Flexible-Duct-R6-Silver-Jacket-F6IFD4X144/203420974
The actual tube inside is some kind of plastic. ...
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How do I vent a new above-range vent on an interior wall into the previous, existing island downdraft vent which outlets 36’ away
How can I tie in a new range hood, interior wall (with 2nd floor) to the previous down draft island vent (1986). The vent would go 13’ then into a crawl space under a sunroom and will exit at a total ...
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6" open HVAC supply open in floor cavity
While doing some remodel in my basement I noticed a 6" supply run just left open in my floor cavity:
I have verified that there is no other pipe any where close to which this should be attached. ...
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How to attach ducting to 5.8 in bathroom fan outlet?
I am trying to install a bathroom fan. The fan has an outlet port for a duct, which I need to connect to the existing ductwork.
The outlet port is a round rigid metal piece. You're supposed to attach ...
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Should I replace the HVAC or install a mini split in my garage?
I have a detached garage that was built with an HVAC system. Don’t think anything has been updated since the house was built 20 years ago. It was disclosed when I bought the house that it was ...
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Drain line on outdoor AC unit not draining
My Complete HVAC unit is outside, the drain hole at the bottom is not draining any water, water seeps out the side of the unit about halfway way up the unit instead… line must be clogged… how do I get ...
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Why does my indoor blower shut down 5 min after when I turn to heat mode?
I have a Tempstar Heat pump system and starting this year I went to heat mode. Heat pump comes on along with the indoor blower. 5 min later the indoor blower will turn off but heat pump remains ...
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carrier weathermaker 8000 not working properly
carrier weathermaker8000 when you request heat the blower motor comes on no inducer motor which should be first to come on blower runs for 3 to 5 minutes then turns off then inducer motor comes on ...
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For a HVAC condenser rated for minimum of 26Amp and max fuse 40 AMP what should be the disconnect sizing 30 or 60 AMPs?
For a HVAC mini split condenser rated for 240v and minimum of 26Amp and max fuse 40 AMP what should be the disconnect sizing 30 or 60 AMPs,
I am looking to hookup the mrcool 27k condenser which is ...
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Old trane furnace won't stay lit
I have a very old trane blu080f924b2 furnace that won't stay lit. It has a spark ignitor, that clicks, and lights the gas but it burns for a few seconds and then shuts off and the ignitor starts ...
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Multiple vents inside and outside laundry room
I have recently moved in a house built in 2021. Its been a couple of months but I noticed today that there is an exhaust vent that is continuously running in the laundry room and there is no switch ...
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Should I replace an old furnace with a mini split unit? [closed]
I have a very small house that is close to being 700 ft.². I live in the middle of Illinois some winters it gets really cold , many degrees below zero. Last winter I noticed my furnace having a bad ...
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Furnace wiring diagram: HUM 120 VAC or 24 VAC can be used
On my furnace wiring diagram located on the inner cover, it states that the HUM dry contact terminals can use either 120v or 24v. How is this possible? There is no reference to how to switch this.
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First finishing project: Attic or Basement for office/studio? [closed]
First time homeowner here, 100 year-old brick bungalo in Chicago where we have very cold Winters and hot Summers. I have my choice of an unfinished basement or unfinished attic to build my home office/...
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advice on gambrel roof garage with 2nd floor apartment
1st time home owner, plan to keep property long term so like to do things the best way possible for long term. Doing as much myself as possible.
Looking for advice on completing apartment above a ...
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A/C vent not connected to duct?
So I am in the process of doing a light reno to a bathroom in my 1954 ranch style home and I took off the a/c vent to wash it and/or buy a new one. To my surprise (okay not really surprise— there was ...
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Heater and fan don't work at the same time but work fine independently!
I am having a problem with my Frigidaire heater and fan. When the heater starts working fan stops and vice versa. they both work fine independently but not at the same time. It happened after I ...
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What size breaker & wire do I need for my mini-split installation?
I am looking at DIY-MULTI3-27HP230C
Electrical is described around page 42 https://mrcool.com/wp-content/dox_repo/mc-diy-4-mz-im-um-en-01.pdf
I've read MRCool 24k BTU breaker size, wire gauge and ...
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Ridding of the nasty mildew smell throughout the home
My aunt turned on her heat and along came the nasty smell of musty mildew, the odor is now taking on the clothes, blankets and pillows in the home ! Please help
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Bleeding Underfloor Heating Without Manifold (with pics!)?
We have house extension with underfloor heating. Underfloor heating was added after the extension was built. It is very unevenly heated - like 20% of the area. It was like that since we've bought the ...
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What should I consider when deciding between a PTAC and a mini-split?
I have built a workshop addition to my garage and both will be insulated. I'm located in Central Indiana, so we get chilly winters (often down to 0°F) and hot, muggy summers (90°F and 80+% humidity).
...
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Why does my blower turn on intermittently although no heat is called for?
My furnace is a Ruud Activia 90 Plus and the thermostat is a Lyric Round thermostat. I have the thermostat set for 62 degrees in Heat Mode. The indoor temp is currently 68. It seems as though the ...
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Bronze Connected to Black Iron Pipe
Does bronze create corrosion when attached to black pipe for hydronic heating?
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Will adding heat pump second stage overload my service? [duplicate]
The first electrician who installed the 200 amp panel didn't want to connect the 2 stage HVAC, so only connected 1 stage. However, now the heating hasn't been able to keep up in winter. The new ...
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Can an HVAC air filter be installed on the return?
My HVAC air filters are of an odd size, hard to find and very expensive. Can I stop using them altogether and substitute an adequate standard size filter on the return?
Sorry, I wasn't clear enough. ...
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What might cause sporadic small waterspots on ceiling of kitchen?
I have small (ranging from ~1-5 CM) ,sporadically located, water spots on the ceiling of my kitchen that have progressively gotten worse over the last year.
They seem to be right in the dead center of ...
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Thermostat common low voltage [closed]
My thermostat failed and I am replacing it with a Honeywell Lyric T6 pro.
The previous configuration had G,W,R connected with Rc jumpered. The thermostat wire was 5-wire, 22ga I think. I used an ...
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Why would Honeywell 9000 WiFi thermostat lose power on new install?
Replaced a carrier 3ton with Heil 2 1/2 ton 96% eff. Installed new Honeywell 9000 WiFi thermostat. The tstat loses power when burners turn off. Then cycles back on. The ac works fine w the tstat. Also ...
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Where does my C Wire go?
Changing thermostat and need to connect c wire at furnace. I connected to the brown bundle based on the wiring diagram and it worked to get power to the new thermostat. However, only the the fan runs ...
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New Goodman 96% furnace install - E11 open roll out error
Furnace will run for about 15 minutes, then I get E11 open roll out error. New install. 3" intake and exhaust transition to 4" immediately, used same pipes as previous furnace. Furnace is ...
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Can I temporally block a duct trunk to only heat part of my home?
I live in the basement and I only occasionally use the upstairs. I don't want to heat the rest of the house most of the time. I'm contemplating installing retractable diverters on the trunk that feed ...
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How can I update an old electric furnace in my mobile home? [closed]
I rent a small one-bedroom trailer with an old electric furnace from the 70s. My electric bills in the winter are insane, especially relative to the size of the space.
My suspicion is that the main ...
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Heat Pump Air Exchanger efficiency gains in Snow/Cold
I have a 5 ton Bosch air to air heat pump, just installed last fall. I built a small timber framed cover to protect it from snow. One thing I was hoping to also do was to cover the sides of the small ...
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Looking for advice for external vent of OTR microwave
Our over-the-range microwave is currently configured for recirculating ventilation, which is less than ideal for many reasons (one of which being that it's over a gas range..). We discovered that ...
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